NextCloud’s built in office is powered by Libre Office and they have an official Only Office integration as well.

Also missing are WPS Office and Only Office.

Joke’s on them. I can’t afford to replace my 20 year old car because everything is completely unaffordable in this hellscape

You have to accept that privacy costs money because your data isn’t being sold. For $5+ a month you can use proton Mail or tutanota. For ~$2 a month you can use Zoho mail or Titan mail.

Whatever you choose, it will be worth it.